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M. E. CLARK & IVI. SHEBESTA. MACHINERY FOR SANDING AND FINISHING.

No. 513,880. [Patented Jan.80,1894.

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M. E. CLARK & M. sHBBEsTA, MACHINERY FOR SANDING AND FINISHING.

No. 513,880. Patented Jan. 30, 1894.

(No Model.) 6 Sheets-Sheet 3. M. E. CLARK 8v M. SHEBESTA. MACHINERY FOR SANDING AND FINISHING.

Patented Jan. 30, 1894.

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M. E. CLARK & M. SHEBESTA. MAGHINERY FOR SANDING AND FINISHING.

, N0. 513,880, Patented Jan. 30, 1894.

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(No Model.)-

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No. 513,880. Patented Jan. 30, 1894.

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UNITED STATES PATENT OFFICE.

MERRILL E. CLARK AND MICHAEL SHEBESTA, OF WORCESTER, MASSACHU- SETTS, ASSIGNORS TO TI-IEDRAPERY FIXTURE AND WOOD CARVING COMPANY, OF SAME PLACE.

MACHINERY FOR SANDING AND FINISHING.

SPECIFICATION forming part of Letters Patent No..513,880, dated January 30, 1894.

Application filed March 30,1893.

To all whom it may concern:

Be it known that we, MERRILL E. CLARK, citizen of the United States, and MICHAEL SHEBESTA, a subject of, the Emperor of Austria-Hungary, residents of Worcester, in the county of Worcester and Commonwealth of Massachusetts, have jointly invented certain new and useful Improvements in Machinery for Sanding and Finishing, of. which the folro lowing is a specification.

The object of our invention is to provide a machine by means of which stock may be sanded or finished between two or more revolving belts, the arrangement of the mechanism being such that uneven and curved, as well as plain, surfaces may be successfully treated.

In our improved machine the stock is exposed to the action of one or more pairs of abrading or finishing belts, by being passed between them, the belts having a rotary motion in a plane, substantially at right angles with the main axis of the stock, and at the same time motion perpendicular to the main axis of the stock at any given point, so that a smooth and uniform finish may be secured, and a great variety of shapes, round, oval, or flat, with round edges, straight or tapering, and straight or curved, may be treated with equal success, as well as stock of irregular cross-section, such as chair stock, spokes, shafts and handles for all kinds of imple ments.

Our improved machine is clearly illustrated in the accompanying drawings, in which- Figure 1 is a front view. Fig. 2 is a side view. Fig. 3 is a rear view, partlyin section, to illustrate the construction of the vertically adjustable feed-rolls. Fig. 4 is a central, lon- 4o gitudinal section, showing means for actuating the secondary guiding and feed-pulleys. Fig. 5 is a top view of the stand in which the feed-rolls are supported. Fig. 6is a side View of the secondary feed and guide rolls, and

5 their supporting frame. Fig. 7, is a top view of the same. Fig. 8 is a section on line 8, 8, Fig. 6, looking in the direction of the arrow, same figure. Fig. 9 is a front view showing the revolving disk with two pairs of friction Serial No. 468,397. (No model.)

rolls, and mechanism for adjusting them, ingo stead of one pair, as shown in Fig. 1.

In Fig. 1, 1 is the bed-plate of the machine, supportedon suitable legs.

2is a disk capable of being revolved by the main drive-pulley 3. Shown in Fig. 2.

4, 4 are drive-pulleys secured to the disk by means of spindles, to the other end ofwhich, and on the back side of the disk are secured gear-wheels, 5, 5 one of which meshes directly with the large gear wheel 6, shown in dotted lines Fig. 1, and in side elevation Fig. 2, and the other of which is connected with the large stationary gear wheel 6, by the intermediate gear 7, shownin dotted lines Fig. 1, and in side elevation in Fig. 2. V

The main driving pulley 3 and hollow spindle on which is mounted the revolving disk, may conveniently be cast in one piece.

The stationary gear-wheel 6 is fitted loosely to the spindle and bolted to the frame supyo porting the spindle.

8 8 are loose pulleys bolted to the disk 2 and capable of adjustment in the slot 9Fig.

3, by means of the nut 10, and bolt 11, so that the distance between the pulleys 4, 4 and S, 8 7 5 may be varied at pleasure, within certain necessary limits.

12, 12 are abrading or finishing belts of any desired width, shown only in Figs. 1 and 9, one belt running on one set of pulleys 4., 8, and the other belt running on the other set of pulleys 4, 8. It is also obvious that we can use two or more pairs of narrow belts on each set of pulleys, in place of one wide belt.

In this casewe should preferably construct the pulleys with a suitable number of flanges,

to prevent the belts on the same pulley from running together.

13 is an annular plate on the face of the disk, fitting over the end of the hollow spin- 9o dle 14. and secured to the disk by screws through slots in the annular plate, so that the plate can be moved about the hollow spindle within certain limits. The annular plate is also provided with a lip or projection 15, which bears against a slotted plate which acts as a gage and enables the operator to so adjust the annular plate that the belts may be kept out of contact, when stock is not passing through the machine.

17, 17 are loose pulleys secured to opposite sides of the annular plate, across the faces of which the belts run. These pulleys act as friction pulleys, and the annular plate may be so adjusted as to bring them to bear upon the belts with any desired pressure according to the character of the work being done by the machine.

More than one friction pulley can be used with advantage on each set of belts, and in practice we secure excellent results by using two pairs of friction pulleys, instead of one pair as shown in the drawings, Fig. 9 as we thus secure a very even pressure on the stock being treated.

18, 18 are spiral springs, firmly attached to the revolving disk by screws 19, 19 at one end, and attached to the annular plate at the opposite ends so that the belts when acting upon any material passing through the machine may, by means of the friction pulleys above referred to, be brought to bear upon such material with the necessary pressure, as indicated by the dotted lines.

20 is a cone pulley which drives the feeding device, as will more clearly appear hereinafter in connection with the other figures.

21 is a cross-section in dotted lines of a piece of stock being operated upon by the abrading or finishing belts, the portion of the belts also being indicated by the dotted lines. When the stock has passed through the machine the belts return to their normal position shown by the dark lines.

22, 23 are feed-rollers which draw the stock through the machine. The feed-rolls may be moved vertically by the screw adjustment 54, 36, as will more clearly appear hereinafter.

In Fig. 3, the feed-rolls 22, 23, are shown in vertical section. They are each provided with flanges, the flanges of the upper roll running between the flanges of the lower roll. Both rolls are fitted with adjustable rubber linings adapted for different sizes of stock and at the same time increasing the friction of the feed-rolls upon the stock, while the stock is not injured, as it might be, by contact with the faces of the iron rolls. The outer flanges of the feed-rolls being removable, rubber filling of any desired shape can be easily placed upon the rolls. The feed-rolls are actuated by the drive pulley 20 mounted upon the jointed shaft 24, the fixed portion of which is supported in the boxes 45, 46, and the movable portion of which is supported in the boxes 25, 26. The lower feed pulley 23 is keyed to the shaft 24. Motion is communicatedto the upper shaft 27, supported by suitable boxes 30, 31, through the gear wheels 28, 29. The upper feed pulley 22 is keyed to the shaft 27, and its centeris in line with the center of the lower feed-pulley. The flanges 32, 32 of the upper pulley running between the flanges 33, 33 of the lower pulley, the

outer flanges 32, 33 may be removed, being held in place by bolts on the ends of the shafts 27 and 24. The boxes in which the upper and lower shafts run are supported by standards 34, 35, securely bolted to the bed of the machine, and the boxes have a certain amount of vertical adjustment in the standards, regulated by the cranks 54 and 36.

37 is a ball joint of ordinary construction permitting the necessary vertical adjustment of the lower and upper shafts.

The upper and lower boxes are backed up by springs of the requisite stiEness, so that the rolls may more easily be adjusted to the variations in the form of the stock fed through them.

Upon the upper shaft 27, and between the box 31 and the upper pulley 22, is a small pulley 38, which maybe most easily cast asa part of the upper pulley. This small pulley drives the secondary feed-rolls shown in side view in Figs. 4 and 6, and in plan Fig. 7. Either a belt or chain maybe used. In practice I prefer to use a chain.

Figs. 6, 7, and 8, are side, end and top views respectively of the secondary feed-rolls and their supporting frames, and a longitudinal section is also shown in Fig. 4, and Figs. 4 and 7 show the chain connection between the primary and secondary rolls.

39, Figs. 3, 4 and 8 is a casting bolted to the bed of the machine conforming in shape, in cross-section, to the hollow spindle through which the stock passes.

40, 40 are two jaws holding the secondary feed-rolls, and pivoted at 42, 42, upon which points they can freely move. The jaws and secondary rolls are held together by the springs 43, 43, which are secured to the solid part of the frame.

44 is a pulley attached to the upper roll 41, through which motion is imparted to said roll by means of a belt or chain connecting with pulley 38, on shaft 27, Fig. 3.

Having described the details of construction of our machine, we will proceed to describe the manner in which it operates. Power is independently applied to the main driving pulley 3, which drives the revolving disk, and to the pulley 20, which operates the feed-rolls. The disk supporting the sanding or finishing belts is driven at any desired speed. In practice we prefer to maintain a speed of from three hundred and fifty to four hundred revolutions per minute. The disk revolves in the direction of the arrow shown in Fig. 1. Motion is at the same time imparted to the driving pulleys, which actuate the sanding or finishing belts moving them in the direction indicated by the arrows. Any corresponding points on the two belts will at any given time be moving in the same direction, although the belts may be run with good results in opposite directions. The annular plate having been previously adjusted, so as to bring the working surfaces of the belts at a suitable distance from each other, the piece to be acted upon ICC the machine at a uniform speed. When one piece of stock has been acted upon, another is inserted and the operation indefinitely continued. .Infinishing short pieces the lower rear roll may be removed and the short pieces, guided by. the secondary rolls, will drop into any suitable receptacle. I

In Fig. 1 we have represented in dotted lines, a section, 21, of a round piece of stock being operated-upon by the belts, .the dotted lines indicating the position the belts take when the piece is inserted betweenthem, and

the heavy lines indicating the normal positions of the belts, after the stock has passed beyond them, and before another piece is inserted. The piece of stock,2l,being operated upon is also shown in side view in Figs. 2 and 4. The belts not only have arotary motion about the stock, thus evenly treating the entire circumference, by reason of their being mounted upon the revolving disk, but are also moving independently ata high rate of speed in a plane parallel to the disk, so that every.

point in the circumference of the piece being treated, is acted upon by three thousand five hundred feet of belt, per minute, which, if

necessary could be increased to seven thousand feet per minute.

We are not confined in the use of our sanding and polishing machine to stock uniform in cross-section; but, by varying the width of the belts, and the tension upon them, we are able to successfullytreat stock which is not uniform in cross section, such as chair rails, tapering poles, and a great variety of stock turned in ornamental shapes. Where it is desired two abrading belts of different degrees of coarseness can be used simultaneously on each pair of pulleys and also two or more narrow belts can be used on each pair of pulleys where it is necessary to finish stock turned in ornamental shapes with sharp angles. Nor, are we confined, in the use of our machine, to straight stock, the adjustment heretofore explained, in connection with the drawings, Fig. 3, enabling us to treat curved stock by depressing the feed rolls, to any desired extent, by means of the ball-joint and adjustment shown in Fig. 3.

In treating curved stock, the secondary rolls would ordinarilybe removed, unless the stock were very short, in which case the secondary rolls would be left in place, and the lower of the primary feed-rolls removed, permitting the stock to drop into a basket, or other receptacle upon passing through the machine.

By shortening the hollow spindle, it will be seen, that stock with increasingly greater curve can be treated, and the machine can easily be adapted for any special work, within its range, for which it may be required.

We do not confine ourselves to any particular means for imparting motion to the revolving disk or primary, feed-rolls nor to any particular way of communicating motion to the driving pulleys mounted upon the disk, nor to any particular number of friction rolls upon the face of the. disk; nor, to any particular number of finishing belts, which we can vary to meet the various purposes for which the machine can be used; andthe machine maybe used with equal efficiency upon wood, brass, ivory, or any material capable of receiving a finish.

What we claim as new, and desire to secure by Letters Patent, is-

1. In a machine for sanding or finishing stock, a revolving disk, upon which are mounted pulleys arranged to receive a plurality of belts between which stock may be sanded or finished,said belts being capable of adjustment, whereby stock varying in cross-section may be treated.

2. In a machine for sanding or finishing stock, a revolving disk, upon which are mounted two pairs of revolving pulleys, one pulley of each pair being a loosepulley and capable of adjustment in a line perpendicular with the axes of the pulleys, each pair of said pulleys being arranged to receive a plurality of belts, between which stock may be sanded or finished.

3. In a machine for sanding or finishing stock, in combination with a revolving disk,

upon which are mounted pulleys arranged to receive a plurality of belts, between which stock may be sanded, a plurality of loose pulleys, mounted upon said disk and capable of being brought in contact with said belts, by which means the distance between the working faces of the belts may be varied.

4. In ,a machine for sanding or finishing stock, the combination with a revolving disk, upon which are mounted pulleys arranged to receive a plurality of belts, between which stock may be sanded or finished, of a plurality of loose pulleys mounted upon an annular plate, said plate being concentric with the hollow spindle bearing said revolving disk, and adjustable, whereby, the contact of one or more of said loose pulleys with each of said belts, regulates the distance between the working faces of said belts. V

5. In a machine for sanding or finishing stock, the combination with a revolving disk, upon which are mounted pulleys arranged to receive a plurality of belts between which stock may be sanded or finished, of an annular plate,upon which are mounted a plurality of loose pulleys; said plate being concentric with the hollow spindle bearingsaid revolving disk, and held in place upon the disk by means of screws passed through elongated slots, thus permitting the plate to move through a certain distance; said annular plate being also provided with a lug bearing against an adj ustable stop consisting of a slotted strip of metal fastened to the disk by means of a screw, whereby the plate may be adjusted to prevent the working faces of the belts coming in contact, when running idly, said annular plate also being provided with springs which regulate the amount of pressure by the sanding or finishing belts, upon stock passing through the machine.

6. In a machine for sanding or finishing stock, the combination with a revolving disk upon which are mounted pulleys arranged to receive a plurality of belts, between which stock may be sanded or finished, of feed rolls arranged to advance the stock through the machine, said feed rolls being capable of adjustment in a line, substantially parallel with the face of the revolving disk whereby curved stock may be acted upon by the belts.

7. In a machine for sanding or finishing stock, the combination with a revolving disk upon which are mounted pulleys arranged to receive a plurality of belts between which, stock may be sanded or finished and feedrolls arranged to advance the stock through the machine, of intermediate feed-rolls, sub stantially as shown and described.

8. In a machine for sanding or finishing stock, rubber-lined feed-rolls, provided with movable flanges, said lower feed-roll being mounted upon ashaft capable of movementin a line substantially parallel with the face of the revolving disk, which shaft imparts motion through gears, or other suitable connection, to the shaft, bearing the upper roll, which shaft is also capable of being moved in a line substantially parallel with the face of the revolving disk, the adjustment of said upper and lower shafts being regulated by a screw and springs, acting upon the boxes in which said shafts revolve.

- MERRILL E. CLARK.

MICHAEL SHEBESTA. Witnesses:

O. G. WASHBURN, R. M. WAsHBURN. 

